Kimi K3.1 Pro 61.1/100Rank 10/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Kimi K3.1 Pro leads Muse Spark 1.3 by 16.9 points on StealthMark, 56.7 to 39.8. It leads on 7 of 9 benchmarks, including Latch, and Muse Spark 1.3 on 2, including Foresight. Kimi K3.1 Pro scores higher on Newton's Mirror, with its largest category advantage in reflections.
See the difference ↘On every task, result quality and reasoning tokens are each compared with all measured models and weighed equally. Each dot is one model.
BENCHMARK BY BENCHMARK
DATASHEET
Kimi K3.1 Pro scores higher on StealthMark. Muse Spark 1.3 is 2.4× cheaper per output token and runs 2.7× faster in our speed test. Both take about 1M tokens of context.
Full datasheets, every price and sourceKimi K3.1 Pro ↗Muse Spark 1.3 ↗
Anticipating threats and planning ahead. Collect coins while avoiding ghosts. Ghosts move before the player each turn, and collisions cost a life. 3 levels in sequence, up to 66 turns in total. Earlier moves and outcomes carry forward, testing learning across levels.


Cooperative planning and learning from experience. Coordinate two robots to push numbered cores onto matching sockets. Pressure plates hold doors open; moving either robot uses one turn. 5 levels in sequence, up to 152 turns in total. Earlier moves and outcomes carry forward, testing learning across levels.


Physics, perspective and recursive reflections, tested together. Explore the test ↗


Kimi K3.1 Pro
The settled sphere, separate airborne black paint and crimson-before-cyan interaction are supported, with a modest crimson travel overshoot. A shared downward framing displacement remains after accounting for the square canvas. The principal limitation is the reflection system: sparse sphere copies and generic curved bands omit most of the ordered mirror-room structure. Materials receive a small upward revision because bounded bright images and dark bands visibly establish some polish, while soft shading and bulky paint remain separate weaknesses.
Muse Spark 1.3
The paint state is incorrectly and poorly drawn, despite a recognizable sphere-and-paint setup. The oversized sphere, oversized compact paint bodies, and blurred wall and floor images further limit the result. Isolated reflection cues provide very little support for the required repeated virtual rooms, nested spherical imagery or emitter mapping.
| Category | Kimi K3.1 Pro | Muse Spark 1.3 |
|---|---|---|
| State at 600 ms | 23.5/25 | 6.0/25 |
| Camera and placement | 10.5/15 | 8.5/15 |
| Reflections | 26.0/120 | 5.5/120 |
| Materials and scale | 7.0/10 | 4.0/10 |
| Floor-damage reward | 0.0/10 | 0.0/10 |
A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.
Visual construction and creative interpretation.


Kimi K3.1 Pro
The transformed reflection, attentive pose and constellation anatomy clearly communicate introspection. Purposeful fine details enrich a coherent composition. Tubular limbs, crowded lower-body overlaps, shallow depth and limited cast lighting keep the overall execution within the competent range.
Muse Spark 1.3
The luminous creature and geometric mirror counterpart communicate self-recognition through a coherent palette and expressive eyes. The transformed reflection is purposeful. Simple oval anatomy, ambiguous reaching-arm construction, shallow spatial staging and limited illumination of nearby surfaces keep the illustration below exceptional execution.
| Category | Kimi K3.1 Pro | Muse Spark 1.3 |
|---|---|---|
| Task & likeness | 8.0/10 | 8.0/10 |
| Anatomy & construction | 5.5/10 | 5.0/10 |
| Space & placement | 6.5/10 | 6.5/10 |
| Light & reflections | 6.5/10 | 7.0/10 |
| Purposeful detail | 7.5/10 | 6.5/10 |
| Artistry & character | 7.0/10 | 5.5/10 |
| Materials & effects | 7.0/10 | 6.5/10 |
| Visual integrity | 7.0/10 | 7.5/10 |
An imagined creature encounters its reflection. The scene tests original character design, visual self-interpretation and the relationship between a subject and its reflected image.
Precise visual recall and portrait reconstruction.


Kimi K3.1 Pro
A coherent, recognizable interpretation with controlled color and readable landscape layers. Replication is limited by the frontal seated construction, elongated facial proportions and oversized, weakly articulated hands. Smooth shading supplies some volume but little of the reference's subtle expression, fabric structure or atmospheric transitions.
Muse Spark 1.3
Dark hair, a restrained smile and overlapping hands suggest Mona Lisa, but replication is weak. The face is markedly elongated, the hands are oval pads with faint finger strokes, and the atmospheric landscape is absent. Soft gradients provide basic volume, while the frontal symmetry, shallow space and sparse clothing detail limit the portrait’s drawing quality.
| Category | Kimi K3.1 Pro | Muse Spark 1.3 |
|---|---|---|
| Task & likeness | 5.0/10 | 1.0/10 |
| Anatomy & construction | 5.0/10 | 1.5/10 |
| Space & placement | 5.5/10 | 1.5/10 |
| Light & reflections | 6.0/10 | 1.5/10 |
| Purposeful detail | 5.5/10 | 1.0/10 |
| Artistry & character | 6.0/10 | 1.5/10 |
| Materials & effects | 5.0/10 | 1.5/10 |
| Visual integrity | 6.5/10 | 3.0/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Kimi K3.1 Pro
A coherent, playful beach illustration with readable animals, an organized composition and an aligned sunset reflection. Connected silhouettes, sand texture and atmospheric effects demonstrate controlled execution. Simplified joints, flattened foreground viewpoints and inconsistent shadows limit anatomical and spatial credibility.
Muse Spark 1.3
The warm sunset, framing palms and colorful beach accessories create an appealing scene with the requested animals, birds and reflections. Construction remains schematic: the raised hand misses the kite string, and a doglike silhouette hangs above the water without clear support. The sun reflection establishes a focal path, but shadows and materials lack depth. An unexplained horizontal bar crosses the sun.
| Category | Kimi K3.1 Pro | Muse Spark 1.3 |
|---|---|---|
| Task & likeness | 8.5/10 | 6.5/10 |
| Anatomy & construction | 5.5/10 | 3.0/10 |
| Space & placement | 5.5/10 | 5.5/10 |
| Light & reflections | 6.5/10 | 6.5/10 |
| Purposeful detail | 6.5/10 | 5.0/10 |
| Artistry & character | 5.5/10 | 3.5/10 |
| Materials & effects | 6.5/10 | 3.0/10 |
| Visual integrity | 7.5/10 | 3.5/10 |
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Physical reasoning, light and visual reconstruction.


Kimi K3.1 Pro
This benchmark has not been assessed yet.
Muse Spark 1.3
This benchmark has not been assessed yet.
A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.
Scene composition and interacting subjects.


Kimi K3.1 Pro
The additional comparisons support retaining the assessment. Readable steering, shaped animal contours and purposeful details coexist with simplified joints, a frontal passenger whose seated weight is weakly conveyed, and limited physical lighting. The angled craft establishes more depth than the riding pose resolves.
Muse Spark 1.3
The raccoon clearly rides on the dog's back, and the dog's paws reach the jet ski controls. Expressive faces and bright colors make the scene appealing. Simplified joints, crowded steering geometry and shallow hull perspective limit construction. The sun has no corresponding water reflection, and the splash shapes convey speed more clearly than convincing displacement.
| Category | Kimi K3.1 Pro | Muse Spark 1.3 |
|---|---|---|
| Task & likeness | 7.0/10 | 8.5/10 |
| Anatomy & construction | 5.5/10 | 6.5/10 |
| Space & placement | 6.0/10 | 7.0/10 |
| Light & reflections | 5.5/10 | 5.0/10 |
| Purposeful detail | 7.0/10 | 6.5/10 |
| Artistry & character | 6.0/10 | 5.5/10 |
| Materials & effects | 6.0/10 | 6.0/10 |
| Visual integrity | 7.0/10 | 7.5/10 |
A jet-ski scene pairs a canine driver with a raccoon passenger. It tests the placement and contact of interacting subjects, along with vehicle construction.
Subject construction and spatial relationships.


Kimi K3.1 Pro
A characterful coastal illustration with controlled contours and varied feather, accessory and bicycle detail. Layered scenery and subtle shading enrich the presentation. Soft leg articulation, unresolved riding contacts, shallow depth and generalized lighting limit physical precision.
Muse Spark 1.3
The pelican and bicycle are immediately recognizable, with an expressive face, bold bill and cheerful composition. Both legs connect to the body and reach pedal-like supports, but articulation, saddle support and wing contact with the handlebar remain unclear. Wheel alignment and layering are coherent. Simple landscape shapes, generic shadows and limited material variation constrain the finish.
| Category | Kimi K3.1 Pro | Muse Spark 1.3 |
|---|---|---|
| Task & likeness | 8.5/10 | 8.5/10 |
| Anatomy & construction | 7.5/10 | 6.0/10 |
| Space & placement | 6.5/10 | 7.0/10 |
| Light & reflections | 6.5/10 | 6.0/10 |
| Purposeful detail | 7.5/10 | 7.0/10 |
| Artistry & character | 7.5/10 | 5.5/10 |
| Materials & effects | 6.5/10 | 6.5/10 |
| Visual integrity | 7.5/10 | 7.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.